Silica-coated cellulose nanofiber modified with hydrophobic functional group and pressure sensitive adhesive comprising the same

Abstract

Provided are silica-coated cellulose nanofibers modified with a hydrophobic group capable of improving the mechanical properties of a pressure-sensitive adhesive while maintaining the adhesive performance of the pressure-sensitive adhesive; and a pressure-sensitive adhesive including the same.

What is claimed is: 
     
         1 . Cellulose nanofibers comprising silica nanoparticles coated on the cellulose nanofibers and a hydrophobic group bonded to the silica nanoparticles. 
     
     
         2 . The cellulose nanofibers according to  claim 1 , wherein the hydrophobic group includes one or more compound selected from the group consisting of n-octadecyltrichlorosilane (ODTS), 3-(trimethoxysilyl)propyl methacrylate (γ-MPS), dodecyltrichlorosilane, trichloroethylsilane, trichloro(n-propyl) silane, trimethoxymethylsilane, triethoxymethylsilane, (3-phenylpropyl)methyldichlorosilane, methyltriethoxysilane, (3-phenylpropyl)methyldimethoxysilane, (3-phenylpropyl)methyldiethoxysilane, tris(trimethylsiloxy) chlorosilane, vinyl trimethoxysilane, vinyltriethoxysilane, vinyl-tris(β-methoxyethoxy) silane, γ-glycidoxypropyl-trimethoxysilane, (heptadecafluoro-1,1,2,2-tetrahydrodecyl)triethoxysilane (FAS), (heptadecafluoro-1,1,2,2-tetrahydrodecyl)trichlorosilane (FCS), n-decyltriethoxysilane (DTES), dimethoxydimethylsilane (DMDMS), and dimethoxydiphenylsilane (DMDPS). 
     
     
         3 . The cellulose nanofibers according to  claim 2 , wherein the hydrophobic group is n-octadecyltrichlorosilane (ODTS) or 3-(trimethoxysilyl)propyl methacrylate (γ-MPS). 
     
     
         4 . A polymer composition comprising cellulose nanofibers of  claim 1 . 
     
     
         5 . The polymer composition according to  claim 4 , wherein the polymer composition is a pressure-sensitive adhesive. 
     
     
         6 . A method of preparing the cellulose nanofibers according to  claim 1 , the method comprising:
 a step of dispersing cellulose nanofibers in an alcohol solvent;   a step of forming silica nanoparticles on the surface of the dispersed cellulose nanofibers; and   a step of binding a hydrophobic group to the silica nanoparticles.